EP0716535B1 - Image sensor and information processing apparatus - Google Patents

Image sensor and information processing apparatus Download PDF

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Publication number
EP0716535B1
EP0716535B1 EP96100186A EP96100186A EP0716535B1 EP 0716535 B1 EP0716535 B1 EP 0716535B1 EP 96100186 A EP96100186 A EP 96100186A EP 96100186 A EP96100186 A EP 96100186A EP 0716535 B1 EP0716535 B1 EP 0716535B1
Authority
EP
European Patent Office
Prior art keywords
image sensor
supporting member
fixing member
film
original document
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96100186A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0716535A3 (enrdf_load_stackoverflow
EP0716535A2 (en
Inventor
Haruo Ishizuka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0716535A2 publication Critical patent/EP0716535A2/en
Publication of EP0716535A3 publication Critical patent/EP0716535A3/xx
Application granted granted Critical
Publication of EP0716535B1 publication Critical patent/EP0716535B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H04N1/00976—Arrangements for regulating environment, e.g. removing static electricity
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Definitions

  • the present invention relates to an information processing apparatus on which a contact type image sensor for use in an image reader, a facsimile machine or the like is mounted. More particularly, the present invention relates to an improvement in the composition of parts of the above-described contact type image sensor.
  • Fig. 1A is a schematic side elevational view which illustrates a conventional contact type image sensor.
  • Fig. 1B is a partial enlarged view of the same.
  • Fig. 2 is a schematic structural view which illustrates the image sensor mounted on the body of the apparatus.
  • the conventional contact type image sensor is arranged in such a manner that one hollow portion 50 is created by a frame 51, a reading glass 52, a bottom plate 53, side plates 54 and the like.
  • optical elements such as an LED array 55, a SELFOC lens 56 and a sensor substrate 57, are accommodated in the above-described hollow portion 50.
  • the structure composed of the frame 51, the bottom plate 53 and the side plates 54 it is difficult, for the structure composed of the frame 51, the bottom plate 53 and the side plates 54 to confine the electric waves which have been generated in the sensor substrate 57 when the contact type image sensor is operated. As a result, the radiant noise characteristics will be deteriorated because the electric waves can easily leak outside. Because of the same reason, the force to shield the electric waves made incident from the external portion of the contact type image sensor is insufficient. Therefore, the contact type image sensor cannot be operated stably. In order to overcome the above-described problems, it might be feasible to employ a structure arranged in such a manner that a large quantity of the ground wires are used or an electric wave shield tape is used. However, the overall cost will be enlarged excessively in this case.
  • US-A-4783700 discloses an illumination means being held by a holding means wherein the holding means is caused by a mounting means to hold the illumination means so that the relative displacement between the illumination means and the holding means is held constant.
  • JP-A-02-022 872 discloses an optical sensor device having a substrate consisting of an iron sheet covered by an enamel layer on which an image sensor chip and conductor layers are installed wherein the chip is installed within a sealing frame and wire bonded to the conductor layers.
  • JP-A-62-248 365 discloses an photoelectric conversion device in which the electrification of a surface is prevented by providing a shielding metallic plate.
  • the object of the present invention is to prevent a malfunction of an image sensor or an image processing apparatus comprising an image sensor by improving the structure of a supporting member and thereby improving the reliability of the image sensor.
  • the object of the present invention is achieved by providing an image sensor as set out in claim 1, as well as by providing an information processing apparatus as set out in claim 6.
  • FIGs. 3A, 3B and 4 illustrate an embodiment of the invention.
  • Reference numeral 1 represents a frame of a contact type image sensor to which the following elements are fastened: a reading glass 2, a sensor substrate 3 having a sensor device 4 serving as the light receiving device, a SELFOC lens 5 serving as an imaging means, side plates 9, 10 and a bottom plate 16 which are secured to the above-described frame 1 and an LED array 21 serving as the illuminating means.
  • the above-described SELFOC lens 5 is secured by lens fixing screws 6, 7 and 8, while the side plates 9 and 10 are secured by side plate fixing screws 11 and 12.
  • the bottom plate 16 is secured by bottom plate fixing screws 17 and 18.
  • the sensor substrate 3 is, via sensor substrate fixing rubber shafts 19 and 20, held between the frame 1 and the bottom plate 16.
  • the LED array 21 is secured by an LED array fixing screw 22.
  • the frame 1 is secured to a fastening plate 23 by a fastening plate fixing screw 24, while the fastening plate 23 is secured to an apparatus body 27 by a contact-type image sensor fixing screw 28.
  • Reference numeral 25 represents a fastening plate side original document guide, 26 represents a lens side original document guide and 29 represents an original document.
  • the above-described frame 1 is formed into its final shape by subjecting an extruded aluminum workpiece to a secondary machining such as a cutting work. In order to prevent the adverse influence upon the internal optical system and preventing the surface oxidation, it subjected to the black alumite treatment. As a result, a non-conductive film is formed on the surface of the frame 1.
  • the reading glass 2 is chamfered on its original document introduction side so as to prevent the undesirable check of the original document.
  • the side plates 9 and 10 comprise leaf springs made of stainless steel, each of the side plates 9 and 10 being secured to the frame 1 by the side plate fixing -screws 11 and 12.
  • the reading glass 2 is secured to the central portion of the frame 1, the side plates 9 and 10 via the reading glass adhesion layers 13, 14 and 15.
  • the bottom plate 16 is formed into its final shape by cutting the extruded aluminum workpiece and the same is subjected to the alumite treatment in order to prevent the change in the surface condition such as oxidation.
  • the LED array 21 has a substrate on which an LED chip, a cylindrical lens and the like are mounted.
  • the fastening plate 23 is a steel sheet which is applied with a surface treatment such as nickel plating, tin plating, aluminum plate or the like exhibiting excellent high frequency conductivity in order to prevent the surface condition change such as oxidation and as well as to improve the electrical conductivity.
  • the fastening plate side original document guide 25 serves as a guide plate for smoothly introducing the original document onto the surface of the reading glass 2, the fastening plate side original document guide 25 being secured to the apparatus body 27.
  • the above-described lens side original document guide 26 is, according to this embodiment, arranged to be a guide plate for smoothly discharging the original document from the reading glass 2, the lens side original document guide being secured to the apparatus body 27.
  • the original document 29 is smoothly introduced onto the surface of the reading glass 2 along the fastening plate side original document guide 25, while the same is discharged from the reading glass 2 along the lens side original document guide 26.
  • the surface of the original document 29 confronting the reading glass 2 is, on the reading glass 2, illuminated by the light beams emitted from the LED array.
  • an image written on the original document 29 is imaged on the sensor device 4 by the SELEOC lens 5.
  • the image is photoelectrically converted by the sensor device 4 before it is amplified on the sensor substrate 3 so as to be transmitted outside of the contact type image sensor.
  • the side plates 9 and 10 are made of stainless steel, thereby they exhibit electrical conductivity. Also the side plate fixing screws 11 and 12 for fixing the side plates 9 and 10 to the frame 1 are made of steel and the same is applied with nickel plating which exhibits excellent electrical conductivity. Since the primary hole 30 for tapping and a thread hole 31 are usually formed in the frame 1 before the alumite treatment is performed, the electrically conductive state is not realized even if screws are directly fastened. According to this embodiment, the tapping primary hole 30 is formed in the frame 1 as shown in Fig. 5B before the alumite treatment is performed. Then, tapping of the frame 1 is performed so that the alumite film is removed in the thread hole 31. As described above, according to this embodiment, an effect can be obtained in that the overall cost can be reduced because the tapping process is arranged to be performed after the alumite treatment in order to establish the electrical conduction.
  • a means shown in Fig. 6 is arranged in such a manner that the frame 1 is first subjected to the alumite treatment before the alumite film is removed in the required portions by a secondary machining.
  • the above-described secondary machining process may comprise a milling process.
  • the removal of the alumite film by tapping as described above is a kind of the secondary machining process.
  • the above-described machining is characterized by a fact that the shape of the portion in which the base surface is caused to appear outside is changed. Therefore, if the base surface of the subject portion can be caused to appear outside by another secondary machining process performed for another purpose, any special process for causing the base surface to appear outside according to the present invention can be omitted.
  • a means shown in Fig. 7 is arranged in such a manner that no alumite film is formed in the required portions at the time of the alumite treatment. That is, masking is previously applied to the portion of the frame 1 the base surface of which must appear outside. Then, the mask is removed after the alumite treatment has been completed. As a result, the base surface of the required portion, to which no alumite treatment is applied, appear outside.
  • the above-described masking process is performed by applying a resist or by using a masking tape each of which is not influenced by the alumite treatment.
  • the above-described machining is characterized in that the shape of the portion, the base surface of which is caused to appear outside, is not changed. Furthermore, an excellent effect can be obtained if it is used to cause a wide area to appear outside.
  • the portion which receives pressure at the time of tightening the screw is, the portion around the tapped portion according to this embodiment. It is preferable that the exposed area be wide within the contact surface, more preferably, an area larger than the screw seat contact area.
  • the bottom plate 16 is made of an aluminum alloy similarly to the frame 1, therefore there is no electrical conductivity.
  • the bottom plate fixing screws 17 and 18 are, similarly to the above-described structure, made of steel and as well as applied with the nickel plating which exhibits excellent electrical conductivity.
  • the frame 1 is subjected to the alumite treatment after the tapping primary hole has been formed therein. Then, tapping of the tapping primary hole is performed. As a result, the alumite film on the frame 1 is removed in the tapped portions 34 and 35.
  • counter-boring reference numerals 36 and 37
  • an electrical conduction is established between the frame 1 and the bottom plate 16 via the seating surface contact portions 36 and 37 of the bottom plate fixing screws 17 and 18 and the tapping portions 34 and 35.
  • a masking treatment applied to the subject portion to cause the base surface to appear outside later is employed in place of the counterboring so as to establish the electrical conduction.
  • any one of the above-described means may be employed to cause the base surface to appear outside.
  • An excellent effect can be obtained from the fact that the base surface appears outside in the portion which receives the pressure at the time of tightening the screw.
  • the surface of the fastening plate 23 has electrical conductivity.
  • the means for fastening the fastening plate 23 to the frame 1 is arranged to be similar to the above-described embodiment.
  • the lens fixing screws 6, 7 and 8 for securing elements having no electrical conductivity may be subjected to proper machining/processing order in terms of convenience in manufacturing the contact type image sensor because the sequential order of the non-conductive film forming process and the tapping process may be arbitrarily determined.
  • the side plates are made of stainless steel, the screws are made of steel and the fastening plate is made of a steel plate applied with electrically conductive plating.
  • the above-described material may be changed if the surface of the element has the electrical conductivity.
  • the side plate may be made of a steel plate applied with electrically conductive plating and the screws and the fastening plate respectively may be made of stainless steel.
  • they may be made of copper or another metal material.
  • a plastic material possessing electrical conductivity because copper dust or carbon dust are mixed may be employed.
  • a non-conductive plastic applied with electrical conductive plating such as nickel plating may be employed.
  • the frame may be made of any electrical conductive material in place of the aluminum alloy.
  • the film on the surface may be formed by another method in place of the alumite treatment if the film is non-conductive.
  • the contact type image sensor is arranged in such a manner that the frame made of an electrical conductive material coated with non-conductive film is employed while arranging the structure in such a manner that an electrical conduction is established between the frame and the members to be fastened to the frame.
  • electric waves generated in the sensor substrate at the time of the operation of the contact type image sensor can be confined by the frame, the bottom plate, the side plates and the like.
  • generation of the antenna effect can be prevented, causing outward leakage of electric waves to be prevented. Therefore, the radiant noise characteristics will not be deteriorated.
  • introduction of external electric wave into the contact type image sensor can be satisfactorily prevented. Therefore, the risk of the unstable operation of the contact type image sensor due to the introduced external electric wave can be overcome.
  • the optical sensor 4 comprises an elongated optical sensor of the type which is composed of amorphous silicone and which is disclosed in US-A-4,461,956 granted to Hatanaka and the like; the inventor of the present invention because its cost can be reduced and an excellent resolution can be obtained.
  • an optical sensor of a type disclosed in U.S.P. 4,791,469 granted to Omi; the inventor of the present invention or that disclosed in U.S.P 4,810,896 granted to Tanaka; the inventor of the present invention may be employed which is arranged in such a manner that a capacity load is provided for the emitter of a bipolar transistor and an output signal is read by means of voltage.
  • a plurality of sensor chips are straight or in a zigzag manner disposed on the surface of the ceramic substrate and the same is subjected to passivation by silicone resin or the like.
  • Fig. 8 illustrates an example of a facsimile machine serving as an image information apparatus constituted by using the sensor unit according to this embodiment and having a communication function.
  • reference numeral 102 represents a supplying roller serving as a supply means for supplying original document OR toward a reading position.
  • Reference numeral 104 represents a separating member for assuredly and one by one separating and supplying the original document OR.
  • Reference numeral 106 represents a platen roller serving as a conveying means disposed at the reading position with respect to the sensor unit 100 and arranged to restrict the surface of the original document OR to be read and as well as convey the original document OR.
  • Symbol P represents a recording medium formed into a roll of paper in which image information transmitted from outside is reproduced in a case of image information read by the sensor unit or in a case of a facsimile machine.
  • Reference numeral 110 represents a recording head serving as a recording means for forming the above-described image, the recording head being allowed to comprise a variety of heads such as a thermal head and an ink jet recording head.
  • the recording head according to this embodiment may comprise a serial type recording head or line type recording head.
  • Reference numeral 112 represents a platen roller serving as a conveying means for conveying the recording medium P to the recording position made by the recording head 110 and as well as restricting the surface of the recording medium P to be recorded.
  • Reference numeral 120 represents an operation panel serving as an input/output means on which switches for receiving operational inputs and display portions for displaying messages and information about the states of the apparatus are disposed.
  • Reference numeral 130 represents a system control substrate serving as a control means and comprising a control portion (controller) for controlling the operation of each unit, a drive circuit (driver) for driving the photoelectrical conversion device, a processing portion (processor) for processing image information and information transmitting/receiving portion and the like.
  • Reference numeral 140 represents a power source for the apparatus.
  • the recording means for use in the information processing apparatus comprises a means the representative structure and the principle of which have been disclosed in US-A-4,723,129 or US-A-4,740,796.
  • one or more drive signals which correspond to information to be recorded and which cause a rapid temperature rise exceeding nuclear boiling are supplied to an electrothermal converter which is disposed to correspond to a sheet or a liquid passage in which liquid (ink) is held.
  • thermal energy is generated in the electrothermal converter, causing film boiling to be generated in the heat effective surface of the recording head. Consequently, bubbles can be formed in liquid (ink), one by one, corresponding to the drive signals, causing a significant effect to be obtained.
  • liquid (ink) is discharged through discharge apertures so that one or more droplet are formed.
  • the recording head is a full line type recording head having a length which corresponds to the maximum width of the recording medium which can be recorded by the recording apparatus
  • a structure may be employed in which a plurality of recording heads disclosed in the above-described disclosures are combined with each other to correspond to the above-described length.
  • Another structure may be employed which has a single recording head constituted by integrating a plurality of heads.
  • the present invention can be effectively adapted to an interchangeable chip-type recording head which is arranged in such a manner that, when it is mounted on the apparatus body, an electrical connection with the apparatus body or ink supplied from the apparatus body can be enabled.
  • the present invention can be effectively adapted to a cartridge type recording head in which an ink tank is integrally provided for the body of the recording head.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Facsimile Heads (AREA)
EP96100186A 1990-11-26 1991-11-25 Image sensor and information processing apparatus Expired - Lifetime EP0716535B1 (en)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP32456290 1990-11-26
JP324562/90 1990-11-26
JP32456290 1990-11-26
JP5561591 1991-02-28
JP5561591 1991-02-28
JP55615/91 1991-02-28
JP16913491 1991-06-14
JP169134/91 1991-06-14
JP16913491 1991-06-14
EP91120087A EP0488129B1 (en) 1990-11-26 1991-11-25 Image sensor and information processing apparatus

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP91120087.1 Division 1991-11-25
EP91120087A Division EP0488129B1 (en) 1990-11-26 1991-11-25 Image sensor and information processing apparatus

Publications (3)

Publication Number Publication Date
EP0716535A2 EP0716535A2 (en) 1996-06-12
EP0716535A3 EP0716535A3 (enrdf_load_stackoverflow) 1996-06-26
EP0716535B1 true EP0716535B1 (en) 2000-06-21

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP96100186A Expired - Lifetime EP0716535B1 (en) 1990-11-26 1991-11-25 Image sensor and information processing apparatus
EP91120087A Expired - Lifetime EP0488129B1 (en) 1990-11-26 1991-11-25 Image sensor and information processing apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP91120087A Expired - Lifetime EP0488129B1 (en) 1990-11-26 1991-11-25 Image sensor and information processing apparatus

Country Status (3)

Country Link
EP (2) EP0716535B1 (enrdf_load_stackoverflow)
JP (1) JP3024715B2 (enrdf_load_stackoverflow)
DE (2) DE69132260T2 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3667251B2 (ja) 2000-05-30 2005-07-06 キヤノン・コンポーネンツ株式会社 イメージセンサ、これを用いた画像処理装置および情報処理システム
JP4625279B2 (ja) 2004-07-09 2011-02-02 株式会社リコー 照明装置、画像読取装置及び画像形成装置
US10082768B2 (en) 2016-12-27 2018-09-25 Ricoh Company, Ltd. Image forming apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62248365A (ja) * 1986-04-22 1987-10-29 Matsushita Electric Ind Co Ltd 光電変換装置
US4783700A (en) * 1986-06-10 1988-11-08 Canon Kabushiki Kaisha Image sensor unit and image reading apparatus having the unit
JPS63182958A (ja) * 1987-01-23 1988-07-28 Matsushita Electric Ind Co Ltd 画像読み取り装置
JP2702131B2 (ja) * 1987-06-12 1998-01-21 キヤノン株式会社 画像読取装置及び該装置を有する画像情報読取装置
JPS6467069A (en) * 1987-09-07 1989-03-13 Toshiba Corp Image information reader
JPH0222872A (ja) * 1988-07-11 1990-01-25 Konica Corp 光センサ装置

Also Published As

Publication number Publication date
JPH0556214A (ja) 1993-03-05
EP0488129B1 (en) 1998-11-04
DE69130446D1 (de) 1998-12-10
DE69132260D1 (de) 2000-07-27
EP0716535A3 (enrdf_load_stackoverflow) 1996-06-26
DE69132260T2 (de) 2000-12-21
JP3024715B2 (ja) 2000-03-21
EP0488129A2 (en) 1992-06-03
EP0488129A3 (en) 1993-03-17
DE69130446T2 (de) 1999-05-20
EP0716535A2 (en) 1996-06-12

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